/ Dictionary / Index T toothless: Meaning and Definition of Find definitions for: tooth•less Pronunciation: (tth'lis), [key] — adj. lacking teeth. without a serrated edge, as a saw. lacking in force or sharpness; dull; ineffectual: a toothless argument. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: toothless (Thesaurus) tooth fungus toothpaste Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language